The Yakovlev Yak-38 (NATO reporting name: "Forger") was Soviet Naval Aviation's only operational VTOL strike fighter aircraft, in addition to being its first operational carrier-based fixed-wing aircraft. It was developed specifically for and served almost exclusively on the Kiev-class aircraft carriers. The prototype VM-01 was finished on 14 April 1970. Though outwardly similar to the British Hawker Siddeley Harrier, it followed a completely different configuration. Together with a vectorable thrust engine in the rear used during flight, two smaller, and less powerful, engines were housed in the front portion of the fuselage and used purely for take-off and landing. The aircraft used a similar layout to the German experimental VTOL strike fighter, the VFW VAK 191B, which began development in 1961, and the contemporary Dassault Mirage IIIV.